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You searched for: subject:"What -- Crater"
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[image]Daedalia Lava Flow - NASA/JPL/MSSS
The ridged surface in the lower half of this image is that of a large lava flow in Daedalia Planum, southwest of the Arsia Mons volcano. The flow was stopped here by a buried crater rim (topographic high in the upper half of the image). MOC image taken June 5, 1999.
Keywords: What -- Crater
Downloads: 5
[image]Gullied Craters 41S - NASA/JPL/Arizona State University
(Released 28 March 2002) This scene shows gullies superposed on the inner walls of four large craters. Most of these gullies appear to emanate from one or two specific layers along the inner crater's entire circumference. The presence of gullies on the equatorward facing slopes is unusual in that most gullied inner crater walls are poleward facing. It appears that there are several distinct layers from which the gullies issue forth as well as different expressions and possibly types and or ages ...
Keywords: What -- Crater
Downloads: 4
[image]Space Radar Image of the Yucatan Impact Crater Site - NASA
Space Radar Image of the Yucatan Impact Crater Site
Keywords: What -- Crater
Downloads: 68
[image]photo-as16-116-18607 - NASA
AS16-116-18607 (23 April 1972) --- Astronaut Charles M. Duke Jr. works at the front of the Lunar Roving Vehicle (LRV) parked in this rock field at a North Ray Crater geological site during the mission?s third extravehicular activity (EVA-3) on April 23, 1972. Astronaut John W. Young took this picture with a 70mm Hasselblad camera.
Keywords: What -- Crater
Downloads: 8
[image]Eruption of Klyuchevskaya Volcano - NASA image courtesy the at NASA GSFC. The image is available in .
Eruptions at the Klyuchevskaya Volcano on Russia�s Kamchatka Peninsula became more violent on March 24, 2005. The Kamchatkan Volcanic Eruptions Response Team boosted the alert level on the volcano to red (its highest alert, reserved for major explosive eruptions) after Klyuchevskaya began to eject clouds of ash and steam as high as 10 kilometers (32,800 feet) above sea level. Seismic activity around the volcano has increased to match Klyuchevskaya�s continuous eruptions.This image, acq...
Keywords: What -- Crater
Downloads: 3
[image]Mount Egon Erupts - NASA image by Jesse Allen, Earth Observatory Team, using data provided by the at Goddard Space Flight Center
Shortly after 12:30 p.m. local time, on September 4, 2004, a large cloud of ash and smoke erupted from Mount Egon on the Indonesian island of Flores. When the Moderate Resolution Imaging Spectroradiometer () flew over on NASA’s satellite a little over an hour later, the light gray cloud straddled the island. The ash plume rose up to 3,000 meters above the volcano’s crater. As of Monday, September 6, up to 2,100 people had been evacuated from villages around the volcano, as the mountain conti...
Keywords: What -- Crater
Downloads: 4
[image]Ash from Grimsvotn Volcano on Iceland's Vatnajokull - Image courtesy Jacques Descloitres, NASA-Goddard Space Flight Center
As fall marches toward winter in the Northern Hemisphere, Iceland’s rugged terrain casts long shadows back on itself, exaggerating the topography of the island's snow-covered mountains, particularly along the eastern coast. On the northeastern portion of the island’s largest ice cap—Vatnajokull—what appears to be another of the season’s long shadows is actually a layer of ash from the recent eruption of the sub-glacial volcano that lies beneath the thick ice.The Grimsvötn Volcano and ...
Keywords: What -- Crater
Downloads: 18
[image]Sheveluch Volcano Erupts - NASA image courtesy Jeff Schmaltz, at NASA GSFC
On October 12, 2004, a plume of ash streamed to the southwest from the Sheveluch Volcano on Russia’s Kamchatka Peninsula. The ash could be erupting from the volcano, or it could be old ash, resuspended on the wind, but without ground confirmation, it is impossible to tell. The Moderate Resolution Imaging Spectroradiometer () on NASA’s satellite, which acquired this image, did not detect a thermal emission associated with an eruption, but that does not necessarily mean that the volcano is not...
Keywords: What -- Crater
Downloads: 6
[image]Summit Crater of Mauna Loa - Astronaut photograph was provided by the Earth Sciences and Image Analysis Laboratory at Johnson Space Center. Additional images taken by astronauts and cosmonauts can be viewed at the NASA-JSC
high resolution, 1000 pixel-wide imageAstronauts obtained this detailed image of the summit caldera of Mauna Loa volcano, called Mokuaweoweo Caldera. Mauna Loa is the largest volcano on our planet—the summit elevation is 4,170 m (over 13,600 ft), but the volcano’s summit rises 9 km above the sea floor. The sharp features of the summit caldera and lava flows that drain outward from the summit are tribute to the fact that Mauna Loa is one of the Earth’s most active volcanoes...
Keywords: What -- Crater
Downloads: 6
[image]Ash from Grimsvotn Volcano across Vatnajokull Ice Cap - Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC
As fall marches toward winter in the Northern Hemisphere, Iceland’s rugged terrain casts long shadows back on itself, exaggerating the topography of the island’s snow-covered mountains, particularly along the eastern coast. On the northeastern portion of the island’s largest ice cap—Vatnajokull—what appears to be another of the season’s long shadows is actually a layer of ash from the recent eruption of the sub-glacial volcano that lies beneath the thick ice.The GrimsvöVolcano and...
Keywords: What -- Crater
Downloads: 9
[image]Eruption of Klyuchevskaya Volcano - NASA image courtesy the at NASA GSFC. The image is available in .
Eruptions at the Klyuchevskaya volcano on Russia’s Kamchatka Peninsula became more violent on March 24, 2005. The Kamchatkan Volcanic Eruptions Response Team boosted the alert level on the volcano to red, the highest alert reserved for major explosive eruptions, after Klyuchevskaya began to eject clouds of ash and steam as high as 10 kilometers (32,800 feet) above sea level. Seismic activity around the volcano has increased to match Klyuchevskaya’s continuous eruptions.This image, acquired b...
Keywords: What -- Crater
Downloads: 3
[image]Pedestal Crater - NASA/JPL/MSSS
The upper layer of the plains surrounding this impact crater have been stripped and deflated by wind. The rocky ejecta of the crater, however, protected the material beneath the ejecta blanket from such erosion. This process also gives the ejecta deposit a "raised relief" appearance. MOC image from July 6, 1998.
Keywords: What -- Crater
Downloads: 5
[image]Canyons and Mesas of Aureum Chaos - NASA/JPL/Arizona State University
(Released 17 June 2002) This image contains a portion of Aureum Chaos located just south of the Martian equator. This fractured landscape contains canyons and mesas with two large impact craters in the upper left. The largest crater is older than the one above it. This is readily evident because a landslide deposit created by the smaller crater's impact is seen on the larger crater's floor. The overall scene has a rather muted appearance due to mantling by dust...
Keywords: What -- Crater
Downloads: 7
[image]LCROSS impact crater as viewed with near infrared and ultra violet spectrometers. - NASA
LCROSS impact crater as viewed with near infrared and ultra violet spectrometers.
Keywords: What -- Crater
Downloads: 116
[image]Crommelin Crater #2 - NASA/JPL/Malin Space Science Systems
Rare tear-shaped dark dunes in this 6.4 x 7.0 km image (frame 10004) centered near 47 degrees south, 341 degrees west. Figure caption from Science Magazine
Keywords: What -- Crater
Downloads: 6
[image]Apollo 14 Mission image - View of the Lunar Surface towards the Horizon with the High Gain Erectable Antenna in FOV. - NASA
Near-vertical view of the +Y footpad that landed on the crater-rim deposit on the lunar surface. The less-resistant material yielded to the load imposed by the Lunar Module LM and deformed the crater wall. The small Mylar-covered rod to the left of the footpad is aprobe that actuates the contact light on the instrument panel when the probe touches the surface. The gold foil surrounding the landing leg is probably the protective wrapping on the Modularized Equipment Transporter MET...
Keywords: What -- Crater
Downloads: 13
[image]Mount Egon Erupts - NASA image courtesy Jesse Allen, based on data from the at NASA GSFC
Shortly after 12:30 p.m. local time, on September 4, 2004, a large cloud of ash and smoke erupted from Mount Egon on the Indonesian island of Flores. When the Moderate Resolution Imaging Spectroradiometer () flew over on NASA’s satellite a little over an hour later, the light gray cloud straddled the island. The ash plume rose up to 3,000 meters above the volcano’s crater. As of Monday, September 6, up to 2,100 people had been evacuated from villages around the volcano, as the mountain conti...
Keywords: What -- Crater
Downloads: 7
[image]ACD02-0141-001 - NASA/Ames Research Center
Human Robotic Study at Houghton Crater - virtual reality study from NASA Ames (FFC) Future Fight Central simulator tower L-R: Dr Geoffrey Briggs; Jen Jasper (seated); Dr Jan Akins and Mr. Tony Gross, Ames
Keywords: What -- Crater
Downloads: 7
[image]LCROSS impact crater as seen with the mid infrared camera. - NASA
LCROSS impact crater as seen with the mid infrared camera.
Keywords: What -- Crater
Downloads: 51
[image]Anaxagoras Crater - NASA
This image from the Lunar Reconnaissance Orbiter shows the floor of the moon's Anaxagoras crater, including a portion of the crater's anorthositic central uplift. The boulders perched on ridges are eroding out of densely fractured bedrock. This image was taken by the Lunar Reconnaissance Orbiter Camera, or LROC, which consists of a pair of narrow-angle cameras and a single wide-angle camera. The mission is expected to return over 70 terabytes of image data...
Keywords: What -- Crater
Downloads: 33
[image]Mount St. Helens - Image copyright
After over a decade of silence, Mount St. Helens has started to rumble. Following a week of threatening earthquakes, the volcano belched forth a plume of ash and steam on October 1, 2004. Hot rock pushed to the surface, vaporizing the mountain glaciers into steam. The earthquakes continued over the course of the following three days accompanied by another small steam eruption.On October 4, a second cloud of steam billowed from the mountain for about 40 minutes starting at 9:43 a.m., local time...
Keywords: What -- Crater
Downloads: 4
[image]LDEF: Postflight Detail-Impact Crater - NASA/Langley Research Center (NASA-LaRC)
LDEF: Postflight Detail-Impact Crater
Keywords: What -- Crater
Downloads: 8
[image]Mount Etna, Sicily: Image of the Day - NASA -- Astronaut photograph eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS013&roll=E&frame=62714 ISS013-E-62714 was acquired August 2, 2006, with a Kodak 760C digital camera using an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and the Image Science & Analysis Group, Johnson Space Center. The image in this article has been cropped and enhanced to improve contrast. Lens artifacts have also been removed. The spaceflight.nasa.gov/home/index.html International Space Station Program supports the laboratory to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the eol.jsc.nasa.gov/ NASA/JSC Gateway to Astronaut Photography of Earth.
One of the most consistently active volcanoes in the world, Sicily's Mount Etna has a historical record of eruptions dating back to 1500 BC. This astronaut photograph captures plumes of steam and possibly ash originating from summit craters on the mountain: the Northeast Crater and Central Crater, which includes two secondary craters (Voragine and Bocca Nuova). Locals heard explosions coming from the rim of the Northeast Crater on July 26, 2006, and the plumes shown in this image are likely a co...
Keywords: What -- Crater
Downloads: 24
[image]Crommelin Crater #1 - NASA/JPL/Malin Space Science Systems
Dunes in etch pits and troughs in Crommelin Crater in the Oxia Palus area. This 3.2 x 3.5 km image (frame 3001) is centered near 4.1 degrees north, 5.3 degrees west. Figure caption from Science Magazine Science Magazine Article
Keywords: What -- Crater
Downloads: 5
[image]Summit Crater of Mauna Loa: Image of the Day - NASA -- Astronaut photograph eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS005&roll=E&frame =7002 ISS005-E-7002 was provided by the Earth Sciences and Image Analysis Laboratory at Johnson Space Center. Additional images taken by astronauts and cosmonauts can be viewed at the NASA-JSC eol.jsc.nasa.gov/%20 Gateway to Astronaut Photography of Earth.
Astronauts obtained this detailed image of the summit caldera of Mauna Loa volcano, called Mokuaweoweo Caldera. Mauna Loa is the largest volcano on our planet -- the summit elevation is 4,170 m (over 13,600 ft), but the volcano's summit rises 9 km above the sea floor. The sharp features of the summit caldera and lava flows that drain outward from the summit are tribute to the fact that Mauna Loa is one of the Earth's most active volcanoes...
Keywords: What -- Crater
Downloads: 24
[image]photo-jsc2000e02762 - NASA
JSC2000-E-02762 (19 February 2000) --- X-SAR/SRTM digital elevation model (DEM) shows Mt. Cotopaxi in Equador--the highest active volcano in the world. Coordinates of this area are 78 degrees, 24 minutes west longitude and 0 degrees 28 minutes south latitude. More than 50 eruptions of Mt. Cotopaxi have occurred since 1738. With its height of 5897 meters, it is more than 3000 meters higher than the surroundings...
Keywords: What -- Crater
Downloads: 7
[image]Mount St. Helens: Natural Hazards - NASA -- NASA Image Of The Day
After over a decade of silence, Mount St. Helens has started to rumble. Following a week of threatening earthquakes, the volcano belched forth a plume of ash and steam on October 1, 2004. Hot rock pushed to the surface, vaporizing the mountain glaciers into steam. The earthquakes continued over the course of the following three days accompanied by another small steam eruption. On October 4, a second cloud of steam billowed from the mountain for about 40 minutes starting at 9:43 a.m., local time...
Keywords: What -- Crater
Downloads: 20
[image]Sediment History Preserved in Gale Crater Central Mound - NASA/JPL/MSSS
This image continues the theme of things eroded, things covered up, and then exposed again. The circular feature labeled, " Partly-Exhumed Crater,"is interpreted to be an ancient impact crater that formed on the same layered rock surface into which the channel in PIA02844 was cut. This crater, like the channel in PIA02844, indicates that the layered rock was exposed to the atmosphere for some period of time before the next layer of material--the bright, almost white ridged rock that covers most ...
Keywords: What -- Crater
Downloads: 9
[image]LCROSS Crater Candidates - NASA
This image of candidate craters is based on current information about the age, depth and structure of the selected craters. Approximately 30 days before impact, the LCROSS science team will announce the selection of the final impact crater. The selection will take into account any additional information, especially from the Lunar Reconnaissance Orbiter, collected about the candidate craters.
Keywords: What -- Crater
Downloads: 317
[image]Summit Crater of Mauna Loa - Astronaut photograph was provided by the Earth Sciences and Image Analysis Laboratory at Johnson Space Center. Additional images taken by astronauts and cosmonauts can be viewed at the NASA-JSC
high resolution, 1000 pixel-wide imageAstronauts obtained this detailed image of the summit caldera of Mauna Loa volcano, called Mokuaweoweo Caldera. Mauna Loa is the largest volcano on our planet—the summit elevation is 4,170 m (over 13,600 ft), but the volcano’s summit rises 9 km above the sea floor. The sharp features of the summit caldera and lava flows that drain outward from the summit are tribute to the fact that Mauna Loa is one of the Earth’s most active volcanoes...
Keywords: What -- Crater
Downloads: 7
[image]Banda Aceh - NASA
The city of Banda Aceh, on the island of Sumatra, before and after the 2004 Indian Ocean earthquake and resulting tsunami. Top: May 14, 2004. Bottom: December 29, 2004, days after the massive wave struck the coastline. Images taken by the Landsat-7 satellite. Courtesy of NASA/USGS/
Keywords: What -- Crater
Downloads: 64
[image]Apollo 13 Mission image - View of the Keeler crater - NASA
This view of Keeler crater was taken from the National Aeronautics and Space Administration's NASA Apollo 13 spacecraft. Latitude was 9.50 S and Longitude was 163.0 E. Original film magazine was labeled L, film type was Ektachrome Color SO 368. This is equivilent to an Aerochrome 2448 but Ektachome processed and on a thin Estar film support.
Keywords: What -- Crater
Downloads: 31
[image]Employees Watch LCROSS Impact - NASA/Debbie McCallum
Goddard employees in building 3 auditorium watch the LCROSS impact on Cabeus crater. LCROSS will image the impact and provide direct measurements of the plume before it also plunges into the lunar surface. Credit: NASA/Debbie McCallum
Keywords: What -- Crater
Downloads: 80
[image]Apollo 13 Mission image - View of Crater Chaplygin - NASA
Very dark view of Crater Chaplygin partially covered by part of the spacecraft. Image was taken during the Apollo 13 mission. Latitude is listed as 2.0 S by Longitude 152.7 E. Original film magazine was labeled JJ, film type was Color SO 168,process ME4 on an Estar thin base. ASA = 160,considered fairly high speed in its' day. Equivilent to a Kodak type 5241 if in a more conventional format.
Keywords: What -- Crater
Downloads: 26
[image]Mount St. Helens: Image of the Day - NASA -- Images copyright www.spaceimaging.com/ Space Imaging
eoimages.gsfc.nasa.gov/images/imagerecords/5000/5334/MtStHelens_IKO_2004278_lrg.jpg October 4, 2004 (5.10 Mb) On March 8, 2005, Mount St. Helens belched a large cloud of ash and steam, the largest to erupt from the volcano since October 2004. The volcano rumbled back to life in September 2004, and has been restless ever since. The IKONOS satellite snapped the top image of Mount St. Helens on March 9, the day after the most recent eruption...
Keywords: What -- Crater
Downloads: 35
[image]Apollo 13 Mission image - View of the Tsiolkovsky crater - NASA
Excellent view of the lunar farside showing the crater Tsiolkovsky, as photographed by the crew of the Apollo 13 mission during lunar pass. The view is looking southeast toward the lunar horizon. The approximate coordinates of Tsiolkovsky are 128.5 degrees east longitude and 20.5 degrees south latitude. Original film magazine was labeled L, film type was Ektachrome Color SO 368. This is equivilent to an Aerochrome 2448 but Ektachome processed and on a thin Estar film support.
Keywords: What -- Crater
Downloads: 34
[image]Yucatan Impact Crater - Impact craters, SRTM detection of subtle but broad topographic features - NASA/JPL/NGA
The topography of Mexico's Yucatan Peninsula reveals a subtle, but unmistakable, indication of the Chicxulub asteroid impact crater, believed by many scientists to be the cause of a mass extinction event 65 million years ago. In this computer-enhanced image, the crater's outer boundary is visible as the semi-circular, darker green line in the peninsula's upper left corner: a trough only 3 to 5 meters 10 to 15 feet deep and 5 kilometers 3 miles wide...
Keywords: What -- Crater
Downloads: 72
[image]ISRU Technology Demos at Mauna Kea, Hawaii - NASA
February 3, 2010 This is the view of the test site from the ridge above the crater where the Resolve rover is. We have 30mph winds on the ridge that kick up a lot of dust.
Keywords: What -- Crater; Where -- Hawaii
Downloads: 13
[image]LDEF (Flight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A10 - NASA/Langley Research Center (NASA-LaRC)
LDEF (Flight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A10 EL-1994-00018 LDEF (Flight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A10 The flight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken while the LDEF was attached to the Orbiter's RMS arm prior to berthing in the Orbiter's cargo bay. The white paint dots on the clamp blocks located at the center of the experiment trays upper and right flanges appear to be in...
Keywords: What -- INTEGRAL; What -- Crater
Downloads: 4
[image]LDEF (Flight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B07 - NASA/Langley Research Center (NASA-LaRC)
LDEF (Flight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B07 EL-1994-00087 LDEF (Flight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B07 The flight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken while the LDEF was attached to the Orbiter's RMS arm prior to berthing in the Orbiter's cargo bay. The white paint dots on the center clamp blocks of the experiment trays left flange and lower flange appear to be slightly dis...
Keywords: What -- INTEGRAL; What -- Crater
Downloads: 5
[image]Building a Test Stand - NASA/Stennis Space Center (NASA-SSC)
An enormous crater marks the site where the A-2 test stand was being built in 1964 at the Mississippi Test Operations.
Keywords: What -- Crater; Where -- Mississippi
Downloads: 8
[image]MC-25 Thaumasia Region - NASA
Mars digital-image mosaic merged with color of the MC-25 quadrangle, Thaumasia region of Mars. In the northern part, a prominent physiographic feature, Thaumasia plateau, includes a complex array of small- and large-scale faults and ridges and ancient volcanoes. Channel systems, upturned beds, and large troughs occur in places along the southern edge of the plateau. In the southern part, the lowlands that surround the plateau include heavily cratered highland terrain and relatively smooth, low p...
Keywords: What -- Mars; What -- Crater
Downloads: 6
[image]Spirit Takes the Helm - NASA/JPL/Cornell/USGS
This animation shows Spirit driving itself through the rocky terrain of Gusev Crater on sol 118 (May 8, 2004) using its auto-navigation software. Halfway through the drive, the rover spotted a rock bigger than its wheels (25 centimeters or 9.8 inches) and drove around to the left. At the end of its traverse, Spirit encountered several more large rocks, but since they were less than half its wheel height (12 centimeters or 4.7 inches tall), it drove right over them...
Keywords: What -- Spirit; What -- Crater
Downloads: 4
[image]Martian Crater - NASA/JPL/MSSS
This crater on northern Elysium Planitia is a little more than twice the diameter of the famous Meteor Crater in Arizona, U.S.A. It formed by the impact and subsequent explosion of a meteorite. Picture from MOC in July 1998.
Keywords: What -- Crater; Where -- Arizona
Downloads: 6
[image]Ma'adim Vallis From the Top - NASA/JPL
This is a still from an animation showing the geography of Ma'adim Vallis, a valley or channel that enters Gusev Crater. The view of the crater is from the northwest, which is not the direction from which Spirit approached the crater as it landed.
Keywords: What -- Crater; What -- Spirit
Downloads: 5
[image]photo-jsc2004e18844 - NASA
JSC2004-E-18844 (April 2004) --- This artist's rendering represents a concept of possible activities during future space exploration missions. It depicts an observatory in a crater on the dark side of the moon.
Keywords: What -- Crater; What -- Moon
Downloads: 3
[image]photo-iss002e5164 - NASA
SS002-E-5164 (March 2001) --- The Manicouagan Impact Crater reservoir in Quebec, Canada, was photographed early in the mission by one of the Expedition Two crewmembers using a digital still camera.
Keywords: What -- Crater; Where -- Canada
Downloads: 15
[image]Becquerel Crater Deposit - NASA/JPL/Arizona State University
(Released 28 May 2002) The finely layered deposit in Becquerel crater, seen in the center of this THEMIS image, is slowly being eroded away by the action of windblown sand. Dark sand from a source north of the bright deposit is collecting along its northern edge, forming impressive barchan style dunes. These vaguely boomerang-shaped dunes form with their two points extending in the downwind direction, demonstrating that the winds capable of moving sand grains come from the north...
Keywords: What -- Crater; What -- THEMIS
Downloads: 7
[image]Southern rim of Isidis Planitia basin - NASA/JPL/Arizona State University
(Released 11 April 2002) The Science This image, crossing the southern rim of the Isidis Planitia basin, displays the contrasting morphologies of the relatively rough highland terrain (in the lower portion of the image) and the relatively smooth materials of the basin (at top). Upon closer viewing, the basin materials display an extensive record of cratering, including a small cluster of craters just north and west of the two prominent craters in the upper part of the image...
Keywords: What -- Mars; What -- Crater
Downloads: 5
[image]MC-29 Eridania Region - NASA
Mars digital-image mosaic merged with color of the MC-29 quadrangle, Eridania region of Mars. The quadrangle is dominated by heavily cratered highlands, with some moderately cratered plains in the central part and large ridge systems in the southern part. The west-central part is marked by a large impact crater, Kepler. Kepler is an ancient remnant of the many large impact events that occurred during the period of heavy bombardment...
Keywords: What -- Mars; What -- Crater
Downloads: 8
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